At the Swiss public universities tuition fees are relatively (and unexpectedly) low.
Some universities charge slightly higher tuition fees for international students. For practically all universities, you may pay between CHF 500 and CHF 2,000 per semester. Note that there can be smaller additional fees: registration fee; examination fee; semester fee; fee for social and cultural institutions, university sports, use of library; fee for students association, etc.
Check out the tuition fees at the university of your choosing on the respective profile.